Pneumatic tool.



YPLIOATIOH FILED JULY 1l, 1912.

I. W. TOWNSEND.

PNBUMATIG TOOL.

` Patented May 27, 1913.

--tain new and useful Improvements in Pneuparts throughout the same,Figure 1 is a side -W TOWNSEND, Q F TEAGE, TEXAS:

oEErcE.

PNEUMATIC TOOL.

`'To all 'whom t may concern.'

Be it known that I, ISAAC W. TowNsEN-n, a citizen of the United States,residing at Teague, State of Texas, have invented cermatic Tools, ofwhich the following is a specification.

The presen-t invention relates to an auto` matic tool of the typewherein a reciprocatory element is employed to do the wo-rk, and hasparticular reference to adevice -of this character ,so constructed thatAthe ordinary shifting vvalve which is employed to alten: natelyintroduce pressure into opposite ends of th'e cylinder is dispensedwith, and,l such pressure is continually introduced into one end only ofthe cylinder. i

An important object of the invention is; to provide a device of theabove mentioned i character, lwhich is capable of operating@automatically at a very high speed. L A' further object of thisinvention is tol provide a device of the above lnentioned character,which is simple in constr-uctiomf ycheap to manufacture, strong,durable, and.,I reliable in operation.

Other objects and advantages of my invention will be apparent during thecourse ofthe following description. L

In the accompanying drawings forming a part of this Specilication and inwhich like numerals are employed to designate like view of the device,and, Fig. 2 is a front viewV of the same, parts thereof being shown insection. y In the drawings, wherein is illustrated a preferredembodiment of m invention', the j numeral 1 designates a pre erablyupstandg ing stationary support, upon which is rigidly mounted anupstanding cylinder 2. This cylinder is formed upon a side plate 3,which is attached .to the support 1 by bolts 4 or the like. The ends ofthe cylinder 2 are closed by upper and lower heads 5 and ,6,v which areheld in place by bolts 7.

Mounted to reciprocate within the upper portion of the cylinder 2 is apiston 8, providedy with an annular groove 9 to receive a packing ring10, which may be formed of rubber, or leather. The packing ring 10isurged outwardly into proper ,engagement with the inner wall of thecylinder 2 by means of a split annular spring 11. Rigidly connected withthe piston 8 is a dependingrod or reciprocatory element 12, provided,Specification of Letters Paten-t. Application led Inl-y 11, 1912.Serial No. 708,265. Y

ratentednayav, 1913.

with a longitudinally extending groove 13. The lower head 6 includes adepending hollow extension or cup-shaped portionI 14', having an opening15 formed therethrough, through which the rod 12 passes. A portion ofthe wall of the opening 15 is in the form of a spline or key(not'shown), which lits wit-hinthe groovel 'to positively prevent therod 12 from turning upon its longitudinal axis with'relation to thecylinder 2 but allowing it to move freely longitudinally. Detachablyconnected with the lower end of .the rod 12 outwardly of the cup-shapedportion 14, is a hammer head 16 lor other tool. The cupshaped port-ion1l is provided with a suitable number Ofopenings 17, to allow i of thefree passage est air into and out of the lower portion of t-he cylinder2, when the piston 8 is opera-ting. c

'Ihe cylinder 2 fis provided near and suit- #ably spaced from the upperend thereof with a plurality .oflongitudinally extending sets of.relatively small exhaust openings v18. This is an important feature of`the invention, vas' iI have -found from practicaltests that the device`will not satisfactorily operate .with .a single large exhaust opening,

while highly satisfactory resul-ts :are obtain-y able by the employmentof the plurality of longitudinal sets of relatively small exhaustopenings.'

In order that the device may operate properly it -is necessary that vacomparatively large and stili freely Aacting ,coiled spring 19 beemployed to return t-he piston' 8 to its E starting positinn. a' Theturns of the compressible and expansible coiled spring' 19 are muchlarger in diameter than the rod 12, forwhi-ch reason the rod 12 .can nothold the s'prn in its proper position. To overcome this isadvantage Ihave provided the defso pending cup-.shaped-portion 14; .on the head v6,within which cup-shaped portion 'the lower end of the; spring 19 snuglyfits and is held thereby in its proper position, as shown.

Disposed below' and in coperative rela- .tion to the hammer head 16 isan anvil 20 or the like, mounted upon the stationary bracket 21. v f

Leading into the upper end of the cylinder 2 through the head 5 is apressure supply pipe 22, having connection with a source of steampressure or compressed air. A valve structure is connected in the pipe22, comprisiiig a casing 23 and a pivoted yalve 24,-

adapted to assume positions to control the supply of pressure to thecylinder 2. The valve 24 is moved by a swinging arm 25, connected with aretractile coll spring 26, having its upper end connected with astationary bracket 27. The spring 26 normally holds lever-25 in itsuppermost posi- Vtion to maintain the valve 24 in its closed positionforcutting' oi the supply -of pressure to the cylinder 2. The lever 25is moved downwardly for opening the valve 24, by a rod 28, pivotally-connected therewith, 'as shown at 29. This rod extends downwardlyand'is pivotally connected with a treadle or swinging lever 30, as shownat 31. The treadle or lever is pivotally con- .nected with the support1, as shown at 32.

The operation of the device is as follows. The lever 30 is depressedwhereby the rod 28 1s moved downwardly to swing lever 25 to move thevalve 24'to its open position'.

The lever 30 is retained in -lts depressed position as lon as vthedevice is operated and is automatlcally returned to its upper positionby spring 26. At which time the `valve 24: is also moved to its closedposition.

Assuming the pressure, either steam orcompressed air, is beingcontinuously fed through pipe 22 into the upper vend ofthe cylinder 2,the piston8- will be quickly driven downwardly until the same passes thelongitudinal sets ofexhaust openings 1 8. The pressure is now exhaustedthrough the openings 1d, whereby the spring 19 will return the piston l8toits startin position, to be again forced downwardly y the pressureconl tinuously supplied to the upper end of the` cylinder 2. 'The workis of course placed upon the anvil 20 so that it Vmay be struck by thehammer head lor -other tool.-

Although I have described my invention inthe embodiment of areciprocatory hammeroperated by either compressed 'air or steam, yet theprinciple of the invention is not restricted to this form of tool alone,as it may becarried out in'various other more or less similar tools,suchas drills, riveters tor thelike. It is also to be understood thatfthe form of-my invention herewith shown the cylinder,

and described, is to be taken changes in the shape, of parts may bedescribed my invention, I

Having 'thus claim s as a preferredexample of the same, and that certainsize, and arrangement resorted to without departling from the Vspirit ofthev invention as set vforth in the sub-joined claims.

l. In a device Voi .the character described,

a cylinder,

ports which are arranged' iny a row .extending longitudinally of the suply pipe leading into one end of the cylin er, a piston mounted toreciprocate within the cy inder, a'piston rod connected with the piston,site end of the cylinder an opening for the passage of the piston rodand. having .a relatively large pocket formed therein, a relativelylarge sti-' coil gaging theiston and having such large diameter that thesame are spaced away er size to fit snugly within. the 'relaa headconnected with the oppoand' provided with cylinder, a pressure 75.spring ,surrounding the pistonrod and'eni its turns-of from the pistonrod and. are the tive y large pocket whereby the spring 1s held againstdisplacement, and an element connected with the free endv ofthe pistonrod. 5 f

in presence of two witnesses. l j ISAAC w. froys'msmm. A

vWitnesses: Y

l HAnnY'HAnsom-f In testimony: whereof I aixsignature

